TROGLODYTES NIGER. 11 IF. CIIIMI^ANZEE 



51)3 



(PN), signifies an animal m wlucli [hvvv is a xohiminous cuniu'c'tioii 

 bi'twcrn tlu' ccifl)ral cortex and the lati'ial lobes ol the eerebelliim. Such 

 a eoniieetion, as alreacl\ mentioned in pre\ioiis discussions, is mdieatixc 



FK,. 263. CHIMPANZEE. LE\EL OF THE CAUDAL EXIKEMllV OF FHE PO.NS 

 SHO\VIN(; IHE EMEKGFM FIBERS OF THE SIXTH \EH\E. 



CTT, Central TcfjiiK-ntal Trad; ux, Diiterso-spinal Tract; (;ow. Ventral Spinocerebellar Tract; icp, Inferior 

 Cerebellar Peduncle; lo, Inferior Olive; \ii-. Mesial Fillet; nab, Abdiicens Nucleus; nd, Deiters' Nucleus; nr, 

 Nuclius (if Rolando; nsc, Nucleus of Scliwalbe; n6, Alxlucens Nerve; nH. Auditory Nerve; i>i). Predorsal 

 Bundle; i>L, Posterior Longitudinal Fasciculus; pn. Pontile Nuclei; I'v, Pyramid; REr, Reticular Formation; 

 RST, Rubrospinal Tract; spt. Spinothalamic Tract; trd, Descending Trigeminal Tract; tuh, Tuberculum 

 Acusticum; vr;\ iv. Fourth N'entriele. (Accession No. i-;^. Section 26,-. Actual Size 24 X 14 mm.] 



ol an animal in which skilled peilormanct's are de\elo|)ed to an unusually 

 high degree. The pontile nuclei in themsi'Kcs are signilicant ol a rich pallio- 

 ci'rebellar communieal ion. but they also denote the possi'ssion ol an intelli- 

 genee relati\elv acKanced in its de\ flo|jmeiit. TIk' ck'gree ol this (K'\ elopnu'iit 

 has l)een carehill\ tested b\ \arious psychological and psychometric experi- 

 nu'iits. The general conclusion ol \arioiis observers is that tlu' standing ol 



